Also the home URL seams to have some kind of broken BOM header (0x09 0xef 0xbb 0xbf) before the doctype that might confuse. 0x09 is tab so i would suspect that some PHP file is outputting this somehow, maybe a junk tab outside the <?php ?> tags.

But even it returns 200 i get the same message: ` Inferred Property: The og:url property should be explicitly provided, even if a value can be inferred from other tags. Inferred Property: The og:title property should be explicitly provided, even if a value can be inferred from other tags.`
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okapaJan 2 '12 at 1:24

I found some strange characters before "<!DOCTYPE html PUBLIC (...)" in header.php (in my template folder) and deleted it.. Now it's working! Big thanks! :) Just one more question: I'm editing php files with notepad++, so how can i prevent this situations in future?
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okapaJan 2 '12 at 16:48